When will we keep the CD?

ByDiego Sevilla Ruiz

CD is an abbreviation for compact disc, in order to record music data instead of recordsSonyWhenPhillipsIs an optical disc standard developed jointly.World's first commercial CDIt was released in 1982, and since then various standards such as DVD and Blu-ray Disc with larger data capacity have appeared, but even now music is recorded on CD and sold as surely There is a place of activity in. Such a CD is "How long will we keep?To the American nonprofit public radio networkNPRI am researching.

How Long Do CDs Last? It Depends, But Definitely Not Forever: All Tech Considered: NPR
http://www.npr.org/blogs/alltechconsidered/2014/08/18/340716269/how-long-do-cds-last-it-depends-but-definitely-not-forever

In the 1990 's, historical associations and museums came to save all kinds of information on a CD that was considered to be a very robust recording medium. Even now, most of the audio data is still stored on the CD, but those who manage such data in the library etc are worried that the data saved on the CD will disappear .

Library of CongressFenella France working at a laboratory located in the underground is a researcher who is investigating "How long will the CD keep?" The reason why she checks about CDs is simple, because the American Congress library stores and keeps many precious sound sources on CD.

ByFred von Lohmann

France is a person who is a leader of departments conducting research and testing on data preservation at the Library of Congress. A small box is placed in the room where they are conducting research, and this is used to adjust the temperature inside the room to promote the aging effect of CD, and experiment how to use the CD for how long It is repeated.

"Increasing the relative humidity and temperature increases the proportion of chemical reactions that occur in CDs, and we are observing what happens with CDs over time," says France. In this case, it seems that the CD which is stored as "lowest state" in the archive of the library etc. is investigating "how long it can use".

Why is it stored in the "lowest state"? For example, in the case of a small library in a local government, the place where the CD inside the facility is stored as "to keep the optimum environment for storage" Because we do not have facilities and funds, knowing when you can use CDs kept in such facilities is necessary for not losing precious data.

What it turned out by a survey by researchers at the Library of Congress was that "all CDs are not the same robustness".

ByGrytr

Then NPR talked to Michele Youket, a specialist on data preservation working at the Library of Congress. He was kept in the Library of CongressErnst von DohnaniWhen I played the piano · rhapsody, I made a loud noise, playing stopped halfway. This phenomenon called "CD corrosion", if you leave the back side of the CD exposed for a long time, corrupted CD can not reproduce the saved data successfully.

ByAVPreserve

"One of the difficulties in preserving CDs is that the quality of CDs is not uniform.When the quality varies, the quality standards of CDs are great depending on the year of production and the factory produced Because it was different, "Youket said. Furthermore, corrosion of CD was a unique phenomenon occurring only in CDs produced between 1988 and 1993 at a factory in Lancashire, England, a phenomenon seen only in some CDs It is also revealing that it is.

Because there is a big difference in CD quality in this way, "CD has no mean life expectancy, because there is no average CD," Youket says.

ByNational Film and Sound Arc

Approximately 400,000 CDs are kept in the Library of Congress, which varies from parliamentary voice records to past hit songs.

"As the data on real estate was transferred from microfilm to CD in the 1990s all over the world, electronic data is" better than any other recording medium ", that CD Data has been transferred "Property Records Industry Association(PRIA) President Jim Harper. However, considering that the quality of the CD is not uniform, I do not know when to keep it, it is clear that the idea that "CD is superior to any recording medium" was wrong. However, as Harper president says, "Since the budget of any local government is generally strict, it will be difficult for any local government to transfer data from CD to other storage media in the near future," valuable data I am worried about the possibility that it will be lost.

CD production has gradually declined, CD shops are steadily decreasing, and even more PCs are not equipped with recent PCs, so the place of active use of CD will narrow in the future What will happen is obvious. However, it is also true that many people still have CDs.

In addition, it has been found by France's studies that most CDs can be used for centuries if kept properly, and in the case of wanting to lengthen the CD more than "to save the CD from the car during the summer That thing.

ByWarein

Studies at the Library of Congress know that "most CDs will be kept for centuries", but at the Library of Congress of the United States they are beginning to move data materials stored on CDs to their own servers , Because CD quality is not uniform, we do not know which CD will become usable at any moment. So, it is recommended that you store really important data in your hard disk, cloud storage, etc.